P0430 on Your 2024 Chevrolet Silverado
A P0430 code on the 2024 Chevrolet Silverado means the engine control module detected below-threshold catalytic converter efficiency on Bank 2. The 2024 Silverado offers multiple engines: the 5.3L L84 V8 (355 hp), the 6.2L L87 V8 (420 hp), the 2.7L L3B turbo four-cylinder (310 hp), and the 3.0L LM2 Duramax turbo-diesel. On V8 models, Bank 2 is the driver's side bank containing cylinders 2, 4, 6, and 8. On the turbo-four, it refers to the ECU's secondary catalyst monitor.
On a brand-new truck, catalytic converter failure is virtually impossible. This is a sensor defect, software issue, or assembly problem covered under warranty.
Symptoms You May Notice
- Check engine light on
- No significant performance changes
- Possible slight fuel economy decrease
- Possible exhaust odor
- Emissions test failure
Common Causes on the 2024 Silverado
- Defective Downstream O2 Sensor — Factory sensor defects are the most common new-vehicle cause.
- PCM Software Calibration Issue — GM regularly releases calibration updates for the Silverado's various powertrains.
- Exhaust Assembly Defect — An improperly sealed connection during assembly.
- AFM/DFM System Related — The Active Fuel Management or Dynamic Fuel Management system in V8 models can occasionally affect exhaust flow patterns and sensor readings.
Diagnosis and Repair
Take it to the Chevrolet dealer. Your 2024 Silverado is under full factory warranty and the federal emissions warranty (8 years/80,000 miles). Do not attempt repairs or clear the code.
Cost Breakdown
- Warranty Repair — Cost: $0.
- O2 Sensor (theoretical) — $150 to $375 total.
- ECU Reflash (theoretical) — $100 to $200.
- Catalytic Converter (V8, theoretical) — $900 to $2,600 total.
DIY Feasibility
Not recommended on a vehicle under warranty. Let the dealer handle all repairs.
Prevention Tips
- Follow GM's recommended maintenance schedule
- Report warning lights promptly
- Use quality fuel appropriate for your engine
- Allow proper warm-up before heavy load driving
- Keep all service records